#include <stdio.h> 
#include <unistd.h> 
#include <stdlib.h> 

int main(int argc, char **argv) {
    bool test = false;
    test |= true;
    test |= false;
    
    while (true) { 
        sleep(1);
    } 
    if (test)
        printf("hello world.\n");
    return 0;
}
